旋转机构转子部件脱落的幅值谱研究与变幅信号谱的简单分析

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The variable amplitude signal of the system about the fall of the rotor parts in rotation mechanism is simple simulated,some kind of regular change will happen to the amplitude of this signal in frequency domain.The regular is analyzed from the aspect of linear additive in FT and conservation of energy,then use FFT,interpolation method,CZT to proving the correctness for the analysis method in frequency domain,then deepen the understanding to internal operation in DSP.At last,in the general variable amplitude signal,explain the insufficient of FT and presentation the popular method for solving variable amplitude signal is presented.针对旋转机构转子部件缓慢脱落时系统信号的幅值缓慢变化,其频域内幅值亦发生某种有规律的变化,简单地模拟了系统在变幅情况下的信号。将信号从频域傅氏变换的线性叠加性和能量守恒角度去对信号的频域内幅值的变化规律进行分析,并在频域内采用FFT、比值校正法和频谱细化方法进行频谱图简单分析以验证两者准确性,加深对信号处理时内部运算的理解。最后将普通变幅信号引入,用实验事实说明傅式变换本身的一些不足并做简单的分析,并简单介绍了变幅信号现今采用的一些处理方法。